id	domain	url
stem-2531	doi.org	https://doi.org/10.47689/2181-1415-vol2-iss5/s-pp484-491
stem-2531	doi.org	https://doi.org/10.36074/mcnd-22.10.2021
stem-2531	doi.org	https://doi.org/10.36074/logos-29.10.2021.v1.34
stem-2531	doi.org	https://doi.org/10.36074/mcnd-22.10.2021
stem-2531	doi.org	https://doi.org/10.36074/logos-29.10.2021.v1.34
stem-2531	www.bjisrd.com	https://www.bjisrd.com/index.php/bjisrd/article/view/1158
stem-2531	www.bjisrd.com	https://www.bjisrd.com/index.php/bjisrd/article/view/1158